netdev - Re: [iproute2] tc action mirred question

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Date:	Sun, 20 Sep 2009 09:33:27 -0400
From:	jamal <hadi@...erus.ca>
To:	Xiaofei Wu <xiaofei_wu08@...oo.com>
Cc:	linux netdev <netdev@...r.kernel.org>
Subject: Re: [iproute2] tc action mirred    question

On Sun, 2009-09-20 at 02:58 -0700, Xiaofei Wu wrote:

> When the link A-B is not available, 

How do you detect this? Is it a path that is broken or a link?

> Could iproute2 'tc' do this?


you could use iproute2 'ip' which supports multi-nexthops, example
off top of my head (for exact syntax run "ip route help")
----
ip route add blah/24 nexthop via a.b.c.d dev wlan0 \
	    nexthop via e.f.g.h dev wlan1 
----

You will probably need to help it by flushing route cache.
You may need to worry about loops on mirroring when the route flipping
happens and need to optimize for that. Please experiment.

cheers,
jamal


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